No, we can't know all possible values without traversing the entire index. Your best bet is to keep a "running count" - when someone enters a new color, save it. If you need to generate this data based on existing properties, I would suggest appengine-mapreduce ( http://code.google.com/p/appengine-mapreduce).
-- Ikai Lan Developer Programs Engineer, Google App Engine Blogger: http://googleappengine.blogspot.com Reddit: http://www.reddit.com/r/appengine Twitter: http://twitter.com/app_engine On Tue, Dec 21, 2010 at 9:22 AM, jacek.ambroziak <[email protected]>wrote: > Say, I have a set of Person Entities with List<String> favoriteColor > property. > People can specify their own sets of colors for that property. > > Can I access the union of these color sets, ie. all the values they have > entered > for this property? The values should sit in the DataStore index, ordered, > but can we access such data? > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
